Line-in speaker system



FIG. 1 is a top, front, side, perspective view of a line-in speaker system showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side thereof;

FIG. 7 is a left side thereof; and,

FIG. 8 is a cross sectional view thereof at the arrows 8—8 in FIG. 2.

The broken lines in the drawings illustrate environmental material that forms no part of the claimed design. 

The ornamental design for a line-in speaker system, as shown and described. 